Bela Lugosi plays a mad scientist, known to the public as The Vampire, who has been having young women kidnapped. Their bodies are found drained of blood. He's apparently using the blood to stay young, though that storyline goes nowhere, and the why of it is never clear. (Lugosi looks terrible in this, in need of makeup.) Instead, his plan for world domination is central to the story, which inadvertently entangles Mother Riley, played by Arthur Lucan, who of course ultimately defeats him.
It's a slapstick comedy full of physical humor, one-liners, word play, and sight gags. There's also a choreographed musical number. I didn't think much of any of this. In fact, I thought the movie was a bore.
In the first act Mother Riley is being hounded by an agent trying to get past rent owed, and he calls her a faggot in exasperation. I looked up the usage, and it apparently meant grumpy old woman.
You can watch an interview
with Lugosi where he's asked about the movie.
I downloaded the 691MB DivX file. Video and audio quality are fine, but for some missing frames in the first act and bad points at reel changes.